amd-xgbe: Allow rx-frames coalescing to be changed anytime

Currently the device must be down in order to update the rx-frames
coalescing setting because the interrupt indicator is set in the
descriptor data during initialization. Allow this setting to be changed
while the device is up by moving the interrupt decision into the
descriptor reset function and base the decision off of the supplied
descriptor index value.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 14 deletions

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
index 80dd7a92f357..96c5e4babbdf 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-dev.c
@@ -1101,9 +1101,24 @@ static void xgbe_tx_desc_init(struct xgbe_channel *channel)
 	DBGPR("<--tx_desc_init\n");
 }
 
-static void xgbe_rx_desc_reset(struct xgbe_ring_data *rdata)
+static void xgbe_rx_desc_reset(struct xgbe_prv_data *pdata,
+			       struct xgbe_ring_data *rdata, unsigned int index)
 {
 	struct xgbe_ring_desc *rdesc = rdata->rdesc;
+	unsigned int rx_usecs = pdata->rx_usecs;
+	unsigned int rx_frames = pdata->rx_frames;
+	unsigned int inte;
+
+	if (!rx_usecs && !rx_frames) {
+		/* No coalescing, interrupt for every descriptor */
+		inte = 1;
+	} else {
+		/* Set interrupt based on Rx frame coalescing setting */
+		if (rx_frames && !((index + 1) % rx_frames))
+			inte = 1;
+		else
+			inte = 0;
+	}
 
 	/* Reset the Rx descriptor
 	 *   Set buffer 1 (lo) address to header dma address (lo)
@@ -1117,8 +1132,7 @@ static void xgbe_rx_desc_reset(struct xgbe_ring_data *rdata)
 	rdesc->desc2 = cpu_to_le32(lower_32_bits(rdata->rx.buf.dma));
 	rdesc->desc3 = cpu_to_le32(upper_32_bits(rdata->rx.buf.dma));
 
-	XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, INTE,
-			  rdata->interrupt ? 1 : 0);
+	XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, INTE, inte);
 
 	/* Since the Rx DMA engine is likely running, make sure everything
 	 * is written to the descriptor(s) before setting the OWN bit
@@ -1138,26 +1152,16 @@ static void xgbe_rx_desc_init(struct xgbe_channel *channel)
 	struct xgbe_ring *ring = channel->rx_ring;
 	struct xgbe_ring_data *rdata;
 	unsigned int start_index = ring->cur;
-	unsigned int rx_coalesce, rx_frames;
 	unsigned int i;
 
 	DBGPR("-->rx_desc_init\n");
 
-	rx_coalesce = (pdata->rx_riwt || pdata->rx_frames) ? 1 : 0;
-	rx_frames = pdata->rx_frames;
-
 	/* Initialize all descriptors */
 	for (i = 0; i < ring->rdesc_count; i++) {
 		rdata = XGBE_GET_DESC_DATA(ring, i);
 
-		/* Set interrupt on completion bit as appropriate */
-		if (rx_coalesce && (!rx_frames || ((i + 1) % rx_frames)))
-			rdata->interrupt = 0;
-		else
-			rdata->interrupt = 1;
-
 		/* Initialize Rx descriptor */
-		xgbe_rx_desc_reset(rdata);
+		xgbe_rx_desc_reset(pdata, rdata, i);
 	}
 
 	/* Update the total number of Rx descriptors */